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Business Acquisitions - Additional Information (Detail) - Aggregated individually immaterial business combinations [member] $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($)
Disclosure of detailed information about business combination [line items] |
Goodwill is deductible for income tax purposes | $ 3.6
Provisions | 0.8
Provision for claims outstanding | 11.1
Gross revenue earned | 86.0
Acquisition-related costs | $ 0.7

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- Definition The amount of acquisition-related costs recognised as an expense for transactions that are recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph m -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_m&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph q -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_q_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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Balance Type: | credit
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- Definition Goodwill and intangible assets expected deductible for tax purposes. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Outstanding provisions reassessed and arised based on expected probable outcome. + References No definition available. + Details
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Namespace Prefix: | stn_
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Balance Type: | credit
Period Type: | instant

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- Definition Provisions for claims recognised as of acquisition date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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